Glenn L. Carle, a former Central Intelligence Agency officer who was a top counterterrorism official during the administration of President George W. Bush, said the White House at least twice asked intelligence officials to gather sensitive information on Juan Cole, a University of Michigan professor who writes an influential blog that criticized the war.

In an interview, Mr. Carle said his supervisor at the National Intelligence Council told him in 2005 that White House officials wanted “to get” Professor Cole, and made clear that he wanted Mr. Carle to collect information about him, an effort Mr. Carle rebuffed. Months later, Mr. Carle said, he confronted a C.I.A. official after learning of another attempt to collect information about Professor Cole. Mr. Carle said he contended at the time that such actions would have been unlawful.

… According to Mr. Carle, Mr. Low returned from a White House meeting one day and inquired who Juan Cole was, making clear that he wanted Mr. Carle to gather information on him. Mr. Carle recalled his boss saying, “The White House wants to get him.”

“ ‘What do you think we might know about him, or could find out that could discredit him?’ ” Mr. Low continued, according to Mr. Carle.

Mr. Carle said that he warned that it would be illegal to spy on Americans and refused to get involved, but that Mr. Low seemed to ignore him.

“But what might we know about him?” he said Mr. Low asked. “Does he drink? What are his views? Is he married?”

Several months after the initial incident, Mr. Carle said, a colleague on the National Intelligence Council asked him to look at an e-mail he had just received from a C.I.A. analyst. The analyst was seeking advice about an assignment from the executive assistant to the spy agency’s deputy director for intelligence, John A. Kringen, directing the analyst to collect information on Professor Cole.

Mr. Carle said his colleague, whom he declined to identify, was puzzled by the e-mail. Mr. Carle, though, said he tracked Mr. Kringen’s assistant down in the C.I.A. cafeteria.

“Have you read his stuff?” Mr. Carle recalled the assistant saying about Professor Cole. “He’s really hostile to the administration.”

Spencer Ackerman points out that this is a rather, um, stupid use of C.I.A. time and manpower:

… all Cole did was say mean things about the Bush team on the internet. He wasn’t a militant, he wasn’t even an activist. He blogged. To devote precious intelligence resources, especially from counterterrorism officials, to silencing him is laughably solipsistic. If you don’t like what someone says about you on the internet, stop Googling yourself. Trolling: Ur doing it wrong.